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Organo-metallic interfaces studied by positron annihilation spectroscopy

Tucker, Carole, Smith, F. A. and Coleman, P. G. 2001. Organo-metallic interfaces studied by positron annihilation spectroscopy. Journal of Physics: Condensed Matter 13 (9) , pp. 1857-1867. 10.1088/0953-8984/13/9/309

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The physical and electronic structures of simple Langmuir-Blodgett films (ω-tricosenoic acid and 12-8 diacetylene) and the film/substrate interfaces have been investigated by Doppler broadening spectroscopy of annihilation radiation and positronium formation spectroscopy, following implantation of monoenergetic positrons in the energy range 0.02-30 keV. The annihilation parameters are sensitive to the insertion of the diacetylene group into an otherwise very similar film, and to polymerization of the film, but not to the presence of cadmium ions in the bulk films. The results suggest the presence of an interface state at which positrons annihilate lower-than-average-momentum electrons; one may cautiously conclude from results for monolayer films that the positron response to this state may be determined by the presence of cadmium ions as well as the nature of the substrate.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: IOP Publishing
ISSN: 0953-8984
Last Modified: 04 Jun 2017 04:54

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